Heavy metal tailing pond leachate treatment device

Abstract

The invention discloses a heavy metal tailing pond leachate treatment device, and particularly relates to the technical field of heavy metal leachate treatment.The heavy metal tailing pond leachate treatment device comprises a sewage inlet pipe used for conveying leachate, and the water outlet of the sewage inlet pipe is sequentially provided with a homogeneous regulation tank, an electrochemical tank, an aeration tank, a sedimentation tank and an ecological filtering tank which are used for treating the leachate from top to bottom; a drainage cylinder for discharging treated leachate is arranged in the middle of the ecological filter tank, the top end of the drainage cylinder sequentially penetrates through the sedimentation tank, the aeration tank, the electrochemical tank and the homogeneous regulation tank from bottom to top, the bottom end of the drainage cylinder penetrates through the ecological filter tank, and the treated leachate is discharged underground through the bottom end of the drainage cylinder. According to the invention, through the arrangement of the homogeneous regulation tank, the electrochemical tank, the aeration tank, the sedimentation tank and the ecological filter tank which are vertically distributed, the leachate flows in the plurality of tank cavities by virtue of the gravity of the leachate, so that the energy is saved, and the operation cost of leachate treatment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy metal leachate treatment, and more specifically to a device for treating leachate from a heavy metal tailings pond. Background Art

[0002] A heavy metal tailings pond refers to a site formed by piling up the waste residues remaining after ore dressing during the process of metal ore mining. These tailings usually contain a large amount of heavy metal elements such as lead, cadmium, mercury, arsenic, etc. If not properly treated, they may cause serious pollution to the surrounding environment and water sources. The main function of the tailings pond is to temporarily store these waste residues for subsequent treatment and disposal. Heavy metal tailings pond leachate refers to the liquid in which heavy metal ions are activated under the combined action of rainwater, surface runoff and air during the process of metal ore mining and ore dressing, and enter the leachate in ionic form through chemical reactions, thereby causing continuous pollution to the environment. These leachates usually contain high concentrations of heavy metal ions such as lead, cadmium, mercury, arsenic, etc. These heavy metal elements are difficult to degrade in the environment. Once they enter the soil and water sources, they will pose a serious threat to the ecological environment and human health.

[0003] Therefore, in order to ensure that the soil and water sources around the tailings pond are not polluted by heavy metals, the prior art has proposed physical and chemical treatment technologies including methods such as precipitation, filtration, adsorption, ion exchange, etc., microbial treatment technologies using the metabolic action of microorganisms, and membrane separation technologies using the selective permeability of semi-permeable membranes. After actual application of the above treatment technologies, it is found that each has its own advantages and disadvantages, and it is also found that the treatment effect that can be achieved by a single treatment technology cannot meet the sewage discharge standard. For example, a multi-component combined ecological treatment system for heavy metal tailings pond leachate with the publication number CN105621819B in the prior art conducts multi-component treatment on the tailings pond leachate by arranging a homogeneous regulation tank, a pH adjustment tank, an electrochemical equipment tank, an aeration tank, an inclined tube sedimentation tank, an artificial ecological filter bed and an artificial ecological oxidation channel connected in sequence, so as to improve the water treatment effect. However, it is known that the flow of sewage between multiple treatment tanks needs to be driven by power equipment such as pumps. The more treatment tanks set in the prior art CN105621819B, the more power equipment is required, and the larger the floor area required for the treatment tanks, which leads to an increase in the sewage treatment cost. At the same time, the increased power equipment will further increase the energy consumption during the water treatment process, resulting in an increase in the sewage treatment operation cost. Summary of the Invention

[0004] To overcome the above-mentioned defects of the prior art, the present invention provides a device for treating leachate from a heavy metal tailings pond. By arranging a homogeneous adjustment tank, an electrochemical cell, an aeration tank, a sedimentation tank, and an ecological filtration tank vertically, the leachate is made to flow in multiple tank cavities by its own gravity, saving energy consumption and reducing the operating cost of leachate treatment. At the same time, the vertical arrangement can also reduce the overall floor area of the present invention.

[0005] To achieve the above object, the present invention provides the following technical solution: A device for treating leachate from a heavy metal tailings pond, including a sewage inlet pipe for conveying leachate. The outlet of the sewage inlet pipe is successively provided with a homogeneous adjustment tank, an electrochemical cell, an aeration tank, a sedimentation tank, and an ecological filtration tank for treating leachate from top to bottom. A drainage cylinder for discharging the treated leachate is arranged in the middle of the ecological filtration tank. The top end of the drainage cylinder successively penetrates through the sedimentation tank, the aeration tank, the electrochemical cell, and the homogeneous adjustment tank from bottom to top. The bottom end of the drainage cylinder penetrates through the ecological filtration tank, and the treated leachate is discharged into the ground through the bottom end of the drainage cylinder. The homogeneous adjustment tank, the electrochemical cell, the aeration tank, the sedimentation tank, and the ecological filtration tank are all annular tanks with open tops. The inner and outer diameters of the homogeneous adjustment tank are the same as those of the electrochemical cell. The outer diameter of the aeration tank is equal to the inner diameter of the electrochemical cell. The inner and outer diameters of the aeration tank are the same as those of the sedimentation tank. The outer diameter of the ecological filtration tank is equal to the inner diameter of the sedimentation tank. The homogeneous adjustment tank is located above the ground, and the electrochemical cell, the aeration tank, the sedimentation tank, and the ecological filtration tank are all located below the ground. The leachate discharged from the sewage inlet pipe flows into the electrochemical cell, the aeration tank, the sedimentation tank, and the ecological filtration tank in turn under the action of its own gravity for treatment.

[0006] In a preferred embodiment, a partition is fixed in the tank cavity of the homogeneous adjustment tank. The partition divides the tank cavity of the homogeneous adjustment tank into an upper cavity and a lower cavity which are distributed up and down. The upper cavity and the lower cavity are connected by a U-shaped pipe. A pH meter for detecting the pH value of the leachate in the upper cavity is installed on the outer wall of the upper cavity. When the solenoid valve at the outer end of the U-shaped pipe is closed, a pH adjustment drug is added to the upper cavity to make the leachate weakly alkaline. A stirring member for stirring the pH adjustment drug and the leachate is arranged inside the homogeneous adjustment tank. One side of the inner wall of the homogeneous adjustment tank is provided with a drain pipe a. The top end of the drain pipe a is communicated with the upper cavity, and the bottom end of the drain pipe a is communicated with the inside of the electrochemical cell for introducing the adjusted leachate into the electrochemical cell.

[0007] In a preferred embodiment, the sewage inlet pipe includes a plurality of outlets and two inlets. The plurality of outlets are all arranged at the top of the homogeneous adjustment tank, and the two inlets are respectively arranged on both sides of the homogeneous adjustment tank for extracting leachate from two positions simultaneously. The stirring member includes a plurality of stirring shafts movably installed inside the homogeneous adjustment tank through sealed bearings. The bottom end of the stirring shaft sequentially penetrates through the partition plate and the bottom wall of the homogeneous adjustment tank and extends to the bottom of the homogeneous adjustment tank. The stirring shaft is movably connected to the partition plate through a sealed bearing. A plurality of groups of stirring blades are fixed on the outer wall of each stirring shaft. One group of stirring blades is located in the lower cavity. The plurality of stirring shafts are divided into multiple groups in pairs. At the top of the stirring shaft located on the outer side of each group, a turbine is fixed. The turbine is movably installed at the water outlet of the sewage inlet pipe through a bracket. A gear a is fixed at the bottom end of the stirring shaft. A gear ring a is meshed with one side of the gear a. The gear ring a is movably arranged at the bottom of the homogeneous adjustment tank through a slide rail. A plurality of gear b arranged side by side are provided inside the gear ring a. Two adjacent gear b are meshed. The inner wall of the gear ring a is meshed with one of the gear b. The gear b located on the inner side is fixed to the bottom end of the stirring shaft located on the inner side of each group, and is used to drive the two stirring shafts in each group to rotate in opposite directions.

[0008] In a preferred embodiment, a plate support is fixed below the interior of the electrochemical cell. A plurality of plates are fixed on the top of the plate support. The number of the plate supports is an even number. Among them, the plates arranged in the odd positions are connected to the negative electrode of the external power supply through wires, and the plates arranged in the even positions are connected to the positive electrode of the external power supply through wires, and are used for electrolytic treatment of the leachate flowing into the electrochemical cell. Two drain pipes b are fixed on the bottom wall of the electrochemical cell. The drain pipes b communicate the electrochemical cell and the aeration tank, and are used to introduce the electrolytically treated leachate into the interior of the aeration tank.

[0009] In a preferred embodiment, water inlet pipes are fixedly connected to both sides of the aeration tank. Above the interior of each water inlet pipe, a deflector plate inclined towards the aeration tank is fixed. The leachate entering the interior of the water inlet pipe through the drain pipe b will flow into the interior of the aeration tank along the inclined surface of the deflector plate. A plurality of swirl aerators are provided at the bottom end of the cavity of the aeration tank. Above the swirl aerators, a stirring plate for stirring the leachate is provided. The stirring plate is driven by a stirring plate driving member to rotate inside the cavity of the aeration tank. A liquid level gauge for monitoring the liquid level height inside the aeration tank and two drain pipes c for communicating the aeration tank and the sedimentation tank are installed on the outer wall of the aeration tank. The leachate aerated inside the aeration tank flows into the interior of the sedimentation tank through the drain pipe c. The stirring plate driving member includes a gear ring b fixed to the two stirring plates. The bottom of the gear ring b is movably connected to a support table a through a slide rail. The outer wall of the support table a is fixed to the inner wall of the aeration tank. A gear c is meshed inside the gear ring b. A rotating shaft a is fixed in the middle of the gear c. The bottom end of the rotating shaft a penetrates through the support table a. The rotating shaft a is movably connected to the support table a through a bearing.

[0010] In a preferred embodiment, a diversion inclined platform is fixed at the bottom of the pool cavity of the sedimentation tank. The vertical cross-section of the diversion inclined platform is triangular, and the hypotenuse of the triangle inclines towards the circle. Two sludge discharge pipes arranged side by side are fixed inside the sedimentation tank. One ends of the two sludge discharge pipes are both communicated with the inside of the sedimentation tank, and conveyors b are fixed at the other ends of the two sludge discharge pipes. An outlet at the top of the conveyor b is provided with a conveyor c; Two scrapers that fit the inclined surface at the top of the diversion inclined platform are provided at the top of the diversion inclined platform. The scrapers are driven by a scraper driving member to rotate forward and backward in the pool cavity of the diversion inclined platform. Cone hoppers are respectively fixed on both sides of the bottom of the sedimentation tank. The bottom end of the cone hopper is communicated with a return pipe, and the outlet of the return pipe is communicated with a conveyor a. The biomass sludge in the sedimentation tank is conveyed into the aeration tank through the conveyor a. Through holes communicating with the inside of the cone hopper are formed at the bottom of the diversion inclined platform and at positions corresponding to the cone hoppers on the diversion inclined platform. There are two such through holes, and the two through holes are respectively arranged on both sides of the pool cavity of the sedimentation tank. The two scrapers are respectively located on one side of the through holes. The biomass sludge is pushed into the cone hoppers from the through holes by the rotating scrapers; A plurality of drain pipes d are fixed on the inner wall of the sedimentation tank. The drain pipes d communicate the sedimentation tank and the ecological filter tank. The upper layer of liquid after sedimentation inside the sedimentation tank is introduced into the ecological filter tank through the drain pipes d; The scraper driving member includes a support platform b fixed to the inner wall of the sedimentation tank. One side of the top of the support platform b is movably connected with a rotating shaft b through a bearing. The bottom end of the rotating shaft a is movably connected with the other side of the top of the support platform b through a bearing. Gear d is fixed at the top end of the rotating shaft b and the bottom end of the rotating shaft a. The two gear d are externally engaged with the same toothed ring c. The toothed ring c is movably installed on the top of the support platform b through a slide rail. The outer wall of the toothed ring c is fixed to the scraper. A driving motor for driving the gear d at the outer end of the rotating shaft b to rotate forward and backward is provided at the bottom end of the rotating shaft b. The toothed ring c is driven to drive the scraper to rotate by the rotating gear d. The rotation angle of the gear d in each direction is 180°;

[0011] In a preferred embodiment, a filter plate is fixed below the pool cavity of the ecological filter tank. An ecological filter bed is provided on the top of the filter plate. The ecological filter bed sequentially includes a soil layer, a fine sand layer, a fly ash layer, a gravel layer, a filler layer and a coarse sand layer from top to bottom. Emergent plants are planted above the soil layer; A plurality of drain pipes e for draining water are fixed below the inside of the ecological filter tank. One end of the drain pipe e is communicated with the bottom of the pool cavity of the ecological filter tank, and the other end of the drain pipe e extends into the inside of the drainage cylinder for discharging the treated water into the drainage cylinder;

[0012] In a preferred embodiment, the drainage cylinder includes a leakage hopper fixed at the bottom end inside the drainage cylinder. A blocking ball is provided at the bottom outlet of the leakage hopper. A suspension rope b is fixed to the top of the blocking ball; A plurality of filter holes are formed in the outer wall of the bottom end of the drainage cylinder, and filter meshes are embedded in the filter holes to prevent underground soil from entering the interior of the drainage cylinder.

[0013] In a preferred embodiment, a blocking platform is provided at the bottom outlet of the conical hopper. The blocking platform is used to block the outlet. A lifting rope a is fixed to the top of the blocking platform. Rope winding mechanisms are provided at one end of the lifting rope a away from the blocking platform and one end of the lifting rope b away from the blocking ball. By winding the lifting ropes a and b respectively through the rope winding mechanisms, the blocking platform and the blocking ball are driven to move upward.

[0014] In a preferred embodiment, steel structure platforms for facilitating personnel movement are fixed at the top ends of the outer walls of the homogeneous adjustment tank, the electrochemical tank, the aeration tank, the sedimentation tank, and the ecological filtration tank. A staircase is provided between the upper and lower steel structure platforms to connect adjacent upper and lower steel structure platforms; A sampling pipe is fixed to the inner wall of the drainage cylinder, and a sampling platform for connecting the steel structure platform outside the homogeneous adjustment tank is provided on one side of the top of the drainage cylinder.

[0015] The technical effects and advantages of the present invention: Aiming at the problem of relatively high treatment cost of leachate in existing heavy metal tailing ponds, the present invention first sets up a vertically distributed homogeneous adjustment tank, an electrochemical tank, an aeration tank, a sedimentation tank, and an ecological filtration tank, and utilizes the gravity of the leachate itself to make it flow in multiple vertically distributed pool cavities, saving energy, reducing energy consumption, and reducing the operating cost of leachate treatment.

[0016] 2. The present invention ingeniously adopts the method of reducing the outer diameter to stagger the arrangement of the aeration tank, the electrochemical tank, the ecological filtration tank, and the sedimentation tank, so that the present invention can meet the design of the top openings of the exposed aeration tank and the ecological filtration tank while meeting the requirement of reducing the overall floor area of the equipment, and further meet the needs of oxygen and light for the aeration process in the aeration tank and the growth of emergent plants in the ecological filtration tank, killing two birds with one stone.

[0017] 3. The present invention utilizes the kinetic potential energy of the leachate discharged from the sewage inlet pipe to drive the stirring blades in the homogeneous adjustment tank to rotate, so as to stir the leachate and the pH adjustment drugs in the homogeneous adjustment tank to make them mix evenly, further saving energy consumption and reducing the operating cost of leachate treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the first view of the overall structure of the present invention; Figure 2 is the second view of the overall structure of the present invention; Figure 3 is a cross-sectional view of the homogenization adjustment tank, electrochemical cell, aeration tank, sedimentation tank, ecological filtration tank and drain pipe of the present invention; Figure 4 is a three-dimensional view of the present invention; Figure 5 is a top view of the homogenization adjustment tank and the stirring member of the present invention; Figure 6 is a schematic structural view of gear a, ring gear a and the homogenization adjustment tank of the present invention; Figure 7 is a cross-sectional view of the homogenization adjustment tank of the present invention; Figure 8 is a cross-sectional view of the electrochemical cell of the present invention; Figure 9 is a schematic structural view of the aeration tank and two stirring plates of the present invention; Figure 10 is a schematic structural view of the bottom of the aeration tank of the present invention; Figure 11 is a schematic structural view of the sedimentation tank and rotating shaft a of the present invention; Figure 12 is a cross-sectional view of the sedimentation tank and the conical hopper of the present invention.

[0020] The reference numerals are as follows: 1, homogenization adjustment tank; 11, partition board; 12, U-shaped pipe; 13, stirring member; 14, pH meter; 15, drain pipe a; 131, turbine; 132, stirring shaft; 133, stirring blade; 134, gear a; 135, ring gear a; 136, gear b; 2, electrochemical cell; 21, electrode plate; 22, electrode plate support; 23, drain pipe b; 3, aeration tank; 31, inlet pipe; 32, stirring plate; 33, stirring plate driving member; 34, drain pipe c; 35, liquid level gauge; 36, guide plate; 37, swirl aerator; 331, ring gear b; 332, gear c; 333, rotating shaft a; 334, support platform a; 4, sedimentation tank; 41, guiding inclined platform; 42, scraper; 43, conical hopper; 44, blocking platform; 45, reflux pipe; 46, conveyor a; 47, scraper driving member; 48, drain pipe d; 49, sludge discharge pipe; 410, conveyor b; 411, conveyor c; 412, suspension rope a; 471, gear d; 472, rotating shaft b; 473, ring gear c; 474, support platform b; 5. Ecological filtration tank; 51. Ecological filter bed; 52. Filter plate; 53. Drain pipe e 6. Drainage cylinder; 61. Leakage hopper; 62. Plugging ball; 63. Suspension rope b; 64. Filter holes; 65. Sampling pipe; 66. Sampling platform 7. Steel structure platform 8. Staircase 9. Sewage inlet pipe Detailed implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Refer to the attached specification Figures 1-4 The present invention provides a device for treating leachate from a heavy metal tailing pond, including a sewage inlet pipe 9 for conveying leachate. The outlet of the sewage inlet pipe 9 is successively provided with a homogeneous adjustment tank 1, an electrochemical cell 2, an aeration tank 3, a sedimentation tank 4, and an ecological filtration tank 5 for treating leachate from top to bottom. The homogeneous adjustment tank 1, the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 are all annular tanks with open tops. The open-top method helps the staff observe the liquid in the tank and also facilitates the inflow of leachate into each tank.

[0023] At the same time, to facilitate the staff to check the treatment status of the leachate in the homogeneous adjustment tank 1, the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5, the present invention fixes a steel structure platform 7 that is convenient for personnel to walk on the top of the outer wall of each of the homogeneous adjustment tank 1, the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5. There is a staircase 8 between the upper and lower steel structure platforms 7, and the staff can shuttle back and forth between multiple steel structure platforms 7 through the staircase 8.

[0024] The sewage inlet pipe 9 in the present invention includes a plurality of water outlets and two water inlets. The plurality of water outlets are all arranged at the top of the homogeneous regulation tank 1, and the two water inlets are respectively arranged on both sides of the homogeneous regulation tank 1, and are used to extract leachate from two positions simultaneously. The leachate extracted through the two water inlets of the sewage inlet pipe 9 will flow into the homogeneous regulation tank 1 through the water outlets, and then the homogeneous regulation tank 1, the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 will treat the leachate in sequence. Moreover, a drainage cylinder 6 for discharging the treated leachate is arranged in the middle of the ecological filtration tank 5. The top end of the drainage cylinder 6 penetrates through the sedimentation tank 4, the aeration tank 3, the electrochemical cell 2, and the homogeneous regulation tank 1 from bottom to top in sequence, and the bottom end of the drainage cylinder 6 penetrates through the ecological filtration tank 5. The treated leachate flows into the interior of the drainage cylinder 6 through the ecological filtration tank 5, and then is discharged into the ground through the bottom end of the drainage cylinder 6. Directly discharging the treated water into the ground also helps to avoid the scouring of the surface soil of the ground by the water flow, so as to reduce the loss of soil and is beneficial to environmental protection.

[0025] During the process of leachate treatment, the homogeneous regulation tank 1 is mainly used for homogenizing the leachate and adjusting the pH value of the leachate. In the present invention, a partition plate 11 is fixed in the cavity of the homogeneous regulation tank 1. The partition plate 11 divides the cavity of the homogeneous regulation tank 1 into an upper cavity and a lower cavity which are distributed up and down. A pH meter 14 for detecting the pH value of the leachate in the upper cavity is installed on the outer wall of the upper cavity. When the solenoid valve at the outer end of the U-shaped pipe 12 is closed, pH adjustment drugs are added into the upper cavity through the opening at the top of the homogeneous regulation tank 1 to make the leachate weakly alkaline, so as to achieve the purpose of adjusting the pH value of the leachate.

[0026] Furthermore, in order to make the pH adjustment drugs and the leachate be evenly mixed, the present invention is provided with a stirring member 13 for stirring the pH adjustment drugs and the leachate inside the homogeneous regulation tank 1. Specifically, such as Figures 5-7As shown in the figure, the stirring member 13 includes a plurality of stirring shafts 132 movably installed inside the homogenization and regulation tank 1 through sealed bearings. The bottom end of the stirring shaft 132 sequentially penetrates through the partition plate 11 and the bottom wall of the homogenization and regulation tank 1 and extends to the bottom of the homogenization and regulation tank 1. The stirring shaft 132 is movably connected to the partition plate 11 through a sealed bearing. A plurality of groups of stirring blades 133 are fixed on the outer wall of each stirring shaft 132. One group of stirring blades 133 is located in the lower chamber. The plurality of stirring shafts 132 are divided into multiple groups in pairs. At the top end of the stirring shaft 132 located on the outer side of each group, a turbine 131 is fixed. The turbine 131 is movably installed at the water outlet of the sewage inlet pipe 9 through a bracket. The leachate discharged through the water outlet of the sewage inlet pipe 9 has its own dynamic potential energy. The flowing leachate will wash the turbine 131 and can drive the turbine 131 to rotate. The rotating turbine 131 can drive the stirring shaft 132 located on the outer side and the stirring blades 133 at the outer end of the stirring shaft 132 to rotate. The rotating stirring blades 133 can stir the leachate in the homogenization and regulation tank 1 from one direction, so that it is mixed evenly with the pH adjustment drug. To improve the mixing and adjustment effect, a gear a134 is fixed at the bottom end of the stirring shaft 132. A gear ring a135 is engaged on one side of the gear a134. The gear ring a135 is movably arranged at the bottom of the homogenization and regulation tank 1 through a slide rail. A plurality of gear b136 arranged side by side are provided inside the gear ring a135 (to ensure that the rotation directions of the stirring shafts 132 are opposite, the number of gear b136 is set to an odd number. Specifically, three gear b136 are provided in this embodiment, as Figure 7 shown). Adjacent two gear b136 are engaged. The inner wall of the gear ring a135 is engaged with one of the gear b136. The gear b136 located on the inner side is fixed to the bottom end of the stirring shaft 132 located on the inner side of each group. The stirring shaft 132 driven by the flowing leachate can also drive the stirring shaft 132 located on the inner side to rotate in the opposite direction through the transmission of the gear a134, gear ring a135 and gear b136 engaged at the bottom end. That is to say, the stirring shaft 132 located on the inner side can drive the stirring blades 133 at its outer end to stir the leachate from another direction. The two different stirring methods can further promote the mixing of the pH adjustment drug and the leachate, so as to improve the adjustment effect of the pH adjustment drug on the leachate in the present invention.

[0027] In the present invention, the upper chamber and the lower chamber are connected through a U-shaped tube 12. When the pH meter 14 detects that the leachate in the upper chamber of the homogenization adjustment tank 1 is weakly alkaline, the solenoid valve at the outer end of the U-shaped tube 12 can be opened through an external controller, so that the leachate in the upper chamber can flow into the lower chamber through the U-shaped tube 12 for temporary storage. At the same time, in the present invention, a drain pipe a15 is provided on one side of the inner wall of the homogenization adjustment tank 1. The top of the drain pipe a15 is connected to the upper chamber, and the bottom of the drain pipe a15 is connected to the inside of the electrochemical cell 2. Then, the controller opens the solenoid valve at the outer end of the drain pipe a15, so that the leachate temporarily stored in the lower chamber can flow into the electrochemical cell 2 through the drain pipe a15.

[0028] Next, the present invention uses the electrochemical cell 2 to electrolytically treat the leachate. As Figure 3 shown, a plate support 22 is fixed below the inside of the electrochemical cell 2. A plurality of plates 21 are fixed on the top of the plate support 22. The number of plate supports 22 is even. Among them, the plates 21 arranged in the odd positions are connected to the negative electrode of the external power supply through wires, and the plates 21 arranged in the even positions are connected to the positive electrode of the external power supply through wires, which are used to electrolytically treat the leachate flowing into the electrochemical cell 2. Through electrolytic treatment, heavy metals in the leachate can be removed. During the electrolysis process, heavy metal ions undergo oxidation-reduction reactions on the anode or cathode, converting into metal ions in lower or higher valence states, or directly forming metal oxides or hydroxides precipitates insoluble in water, thereby achieving the primary removal of heavy metals.

[0029] As Figure 8 shown, two drain pipes b23 are fixed on the bottom wall of the electrochemical cell 2. The drain pipes b23 connect the electrochemical cell 2 and the aeration tank 3. After the leachate has been electrolytically treated, the controller opens the solenoid valve at the outer end of the drain pipe b23, so that the treated leachate in the electrochemical cell 2 can flow into the inside of the aeration tank 3 through the drain pipe b23 for the next step of treatment.

[0030] Then, the aeration tank 3 aerates the leachate. As Figure 3 、 Figure 12 shown, the present invention is fixedly connected with inlet pipes 31 on both sides of the aeration tank 3. A deflector 36 inclined towards the aeration tank 3 is fixed above the inside of each inlet pipe 31. The leachate entering the inside of the inlet pipe 31 through the drain pipe b23 will flow into the inside of the aeration tank 3 along the inclined surface of the deflector 36. A plurality of swirl aerators 37 are provided at the bottom end of the chamber of the aeration tank 3. A stirring plate 32 for stirring the leachate is provided above the swirl aerators 37. The swirl aerators 37 provide sufficient dissolved oxygen during the treatment of the leachate to support the growth and metabolic activities of aerobic microorganisms, thereby improving the degradation efficiency of microorganisms on pollutants and promoting the conversion of heavy metals into forms that are easy to remove, achieving the secondary removal of heavy metals in the leachate.

[0031] During the aeration treatment process, the stirring plate 32 is driven by the stirring plate driving member 33 to rotate inside the cavity of the aeration tank 3, further increasing the dissolved oxygen in the leachate. As Figure 2 shown, in the present invention, a liquid level gauge 35 for monitoring the liquid level height inside the aeration tank 3 and two drain pipes c34 for connecting the aeration tank 3 and the sedimentation tank 4 are installed on the outer wall of the aeration tank 3. Solenoid valves are installed at the outer ends of the drain pipes c34. After the aeration treatment is completed, the externally provided controller will control the solenoid valves at the outer ends of the drain pipes c34 to open, so that the leachate after aeration treatment inside the aeration tank 3 can flow into the sedimentation tank 4 through the drain pipes c34 for sedimentation to separate the liquid and the biomass sludge.

[0032] As Figure 3 、 11 and 12 shown, a diversion inclined platform 41 is fixed at the bottom of the cavity of the sedimentation tank 4. The vertical cross-section of the diversion inclined platform 41 is triangular, and the hypotenuse of the triangle is inclined towards the circle. Two sludge discharge pipes 49 arranged side by side are fixed inside the sedimentation tank 4. One ends of the two sludge discharge pipes 49 are both communicated with the inside of the sedimentation tank 4, and conveyors b410 are fixed at the other ends of the two sludge discharge pipes 49. A conveyor c411 is provided at the outlet at the top of the conveyor b410. After sedimentation, the sedimented sludge can be discharged through the sludge discharge pipes 49, the conveyors b410 and the conveyor c411 to facilitate the harmless treatment of the sludge.

[0033] Before being discharged, the sludge can also be recycled. In the present invention, two scraping plates 42 that fit the inclined surface at the top of the diversion inclined platform 41 are provided at the top of the diversion inclined platform 41. Cone hoppers 43 are respectively fixed on both sides of the bottom of the sedimentation tank 4. The bottom end of the cone hopper 43 is communicated with a return pipe 45. The outlet of the return pipe 45 is communicated with a conveyor a46. The outlet of the conveyor a46 is communicated with the water inlet pipe 31. The scraping plates 42 are driven by a scraping plate driving member 47 to rotate forward and backward in the cavity of the diversion inclined platform 41.

[0034] Through holes communicating with the inside of the cone hoppers 43 are opened at the bottom of the diversion inclined platform 41 and at the positions corresponding to the cone hoppers 43 on the diversion inclined platform 41. There are two such through holes, which are respectively arranged on both sides of the cavity of the sedimentation tank 4. The two scraping plates 42 are respectively located on one side of the through holes. The biomass sludge is pushed into the cone hoppers 43 from the through holes by the rotating scraping plates 42, and then enters the blocking platform 44 through the return pipe 45. The blocking platform 44 conveys it back into the water inlet pipe 31. During the above process, the leachate flowing to the top of the diversion plate 36 through the drain pipe b23 contacts the sludge conveyed back into the water inlet pipe 31, and can simultaneously scour the sludge, enabling the sludge and the leachate to fully contact, so as to improve the removal effect of heavy metals in the leachate by microorganisms in the sludge.

[0035] The bottom outlet of the conical hopper 43 of the present invention is provided with a blocking platform 44 for blocking the outlet. A lifting rope a412 is fixed to the top of the blocking platform 44. One end of the lifting rope a412 away from the blocking platform 44 is provided with a rope winding mechanism. By respectively winding the lifting rope a412 through the rope winding mechanism, the blocking platform 44 is driven to move upward. During the sedimentation process, the position of the blocking platform 44 is as Figure 3 shown. The blocking platform 44 at this position can exactly block the outlet at the bottom of the conical hopper 43, so that the leachate with silt can stay in the sedimentation tank 4 for sedimentation. Only when it is necessary to discharge the silt back into the aeration tank 3, it is necessary to use the winding mechanism to lift the blocking platform 44 upward to open the opening at the bottom end of the conical hopper 43.

[0036] In the present invention, the specific structure of the stirring plate driving member 33 is as Figure 9 , Figure 10 , Figure 11 , Figure 12 shown. The stirring plate driving member 33 includes a gear ring b331 fixed to two stirring plates 32. The bottom of the gear ring b331 is movably connected to a support platform a334 through a slide rail. The outer wall of the support platform a334 is fixed to the inner wall of the aeration tank 3. A gear c332 is meshed inside the gear ring b331. A rotating shaft a333 is fixed in the middle of the gear c332. The bottom end of the rotating shaft a333 penetrates through the support platform a334, and the rotating shaft a333 is movably connected to the support platform a334 through a bearing. The scraping plate driving member 47 includes a support platform b474 fixed to the inner wall of the sedimentation tank 4. One side of the top of the support platform b474 is movably connected to a rotating shaft b472 through a bearing. The bottom end of the rotating shaft a333 is movably connected to the other side of the top of the support platform b474 through a bearing. Gear d471 is fixed to the top end of the rotating shaft b472 and the bottom end of the rotating shaft a333. The same gear ring c473 is externally meshed with the two gear d471. The gear ring c473 is movably installed on the top of the support platform b474 through a slide rail. The outer wall of the gear ring c473 is fixed to the scraping plate 42. A driving motor for driving the gear d471 at the outer end of the rotating shaft b472 to rotate forward and backward is provided at the bottom end of the rotating shaft b472. By the rotating gear d471 driving the gear ring c473 to drive the scraping plate 42 to rotate, the rotation angle of the gear d471 in each direction is 180°. The rotating gear d471 can simultaneously drive the rotating shaft a333 to rotate synchronously. In the present invention, by the scraping plate driving member 47 that drives the scraping plate 42 in the sedimentation tank 4 to rotate, the stirring plate driving member 33 is simultaneously driven to rotate, which can further save energy consumption and reduce the operation cost.

[0037] In the present invention, a plurality of drain pipes d48 are fixed to the inner wall of the sedimentation tank 4, as Figure 3 and Figure 12As shown in the figure, the drain pipe d48 is connected to the sedimentation tank 4 and the ecological filter tank 5. An electromagnetic valve is fixed at the outer end of the drain pipe d48. After the leachate is sedimented, solid-liquid separation occurs, and the liquid will pass through the drain pipe d48 to introduce the upper layer of the liquid sedimented inside the sedimentation tank 4 into the ecological filter tank 5 for further treatment.

[0038] Finally, the present invention treats the leachate by simulating a natural wetland in the ecological filter tank 5. Specifically, as Figure 3 shown, a filter plate 52 is fixed below the cavity of the ecological filter tank 5. An ecological filter bed 51 is arranged on the top of the filter plate 52. The ecological filter bed 51 successively includes a soil layer, a fine sand layer, a fly ash layer, a gravel layer, a filler layer, and a coarse sand layer from top to bottom. Emergent plants are planted above the soil layer. The fine sand layer, fly ash layer, gravel layer, filler layer, and coarse sand layer provided in the present invention can filter the leachate. At the same time, minerals and plant residues in the filter material can chemically react with heavy metal ions, such as ion exchange, coprecipitation, etc., to further fix and remove heavy metals. Moreover, the roots of the planted emergent plants and the microbial community can adsorb and detoxify heavy metals through their biochemical processes, converting them into a form with lower toxicity or a stable form, thereby reducing the bioavailability and environmental risk of heavy metals.

[0039] A plurality of drain pipes e53 for draining water are fixed below the inside of the ecological filter tank 5. As Figure 3 and Figure 7 shown, one end of the drain pipe e53 is communicated with the bottom of the cavity of the ecological filter tank 5, and the other end of the drain pipe e53 extends into the inside of the drainage cylinder 6. The treated water will be discharged into the inside of the drainage cylinder 6 through the drain pipe e53. A plurality of filter holes 64 are opened on the outer wall of the bottom end of the drainage cylinder 6, and filter meshes are inlaid in the filter holes 64 to prevent underground soil from entering the inside of the drainage cylinder 6.

[0040] Moreover, a leakage hopper 61 is fixed at the bottom end inside the drainage cylinder 6. A plugging ball 62 is provided at the bottom outlet of the leakage hopper 61. A suspension rope b63 is fixed at the top of the plugging ball 62. One end of the suspension rope b63 away from the plugging ball 62 is provided with a rope winding mechanism. By winding the suspension rope b63 through the rope winding mechanism, the plugging ball 62 can be driven to move upward. At this time, the opening at the bottom end of the leakage hopper 61 is opened, and the treated leachate will directly be discharged into the ground through the filter holes 64 at the bottom end of the drainage cylinder 6. This method can reduce the scouring of the surface soil.

[0041] When the above-mentioned plugging ball 62 plugs the bottom outlet of the leakage hopper 61, the water flowing out of the drain pipe e53 will accumulate inside the leakage hopper 61. To detect whether the water treated inside the leakage hopper 61 meets the standards, as Figure 7As shown in the figure, a sampling tube 65 is fixed to the inner wall of the drainage cylinder 6. The diameter of the sampling tube 65 is relatively small, and the bottom end of the sampling tube 65 is inserted into the water body at the bottom of the water leakage hopper 61. Based on the principle of capillary rise, the water at the bottom end of the water leakage hopper 61 will rise along the sampling tube 65 to a height flush with the top end of the drainage cylinder 6. At this time, to facilitate the collection of the water inside the sampling tube 65, a sampling platform 66 for connecting the steel structure platform 7 outside the homogeneous adjustment tank 1 is provided on one side of the top of the drainage cylinder 65. Sampling personnel can move to the vicinity of the sampling tube 65 through the steel structure platform 7 outside the homogeneous adjustment tank 1 and the sampling platform 66 for sampling, so as to facilitate subsequent detection and ensure that the water treated by the present invention can meet the standards.

[0042] Under the action of the electrochemical cell 2, the aeration tank 3, and the ecological filtration tank 5, the present invention realizes the multiple treatment of heavy metals in the leachate by adopting different technical means, ensuring that the finally discharged water flow can meet the regulations and will not cause pollution to the environment.

[0043] By cleverly setting the distribution forms of the homogeneous adjustment tank 1, the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5, the vertical distribution method is used to help reduce the floor area of the present invention. Among them, the homogeneous adjustment tank 1 is located above the ground, and the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 are all located below the ground, enabling the treated water flow to be directly discharged underground and preventing the discharged water flow from scouring the surface soil and causing soil erosion.

[0044] The leachate discharged from the sewage inlet pipe 9 flows into the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 in sequence under the action of its own gravity for treatment. The liquid is driven to flow in the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 by using the liquid's own gravity. On the one hand, it can save the investment in power equipment such as pumps and reduce the input cost of leachate treatment. On the other hand, it can also reduce the operating cost during leachate treatment.

[0045] Moreover, in the present invention, the inner and outer diameters of the homogeneous adjustment tank 1 are the same as those of the electrochemical cell 2, the outer diameter of the aeration tank 3 is equal to the inner diameter of the electrochemical cell 2, the inner and outer diameters of the aeration tank 3 are the same as those of the sedimentation tank 4, and the outer diameter of the ecological filtration tank 5 is equal to the inner diameter of the sedimentation tank 4, so that the openings of the aeration tank 3 and the ecological filtration tank 5 can both be exposed to the air, enabling the present invention to meet the oxygen requirements for aeration in the aeration tank 3 and the growth of emergent plants in the ecological filtration tank 5 while satisfying the vertical distribution to reduce the floor area. The design is ingenious and worthy of promotion.

[0046] Each embodiment in this specification is described in a related manner. For the same or similar parts between each embodiment, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A heavy metal tailings pond leachate treatment device, comprising a sewage inlet pipe (9) for conveying leachate, characterized in that: The outlet of the sewage inlet pipe (9) is provided with a homogenizing regulating tank (1), an electrochemical tank (2), an aeration tank (3), a sedimentation tank (4), and an ecological filtration tank (5) for treating leachate in sequence from top to bottom; a drainage cylinder (6) for discharging treated leachate is provided in the middle of the ecological filtration tank (5); the top of the drainage cylinder (6) passes through the sedimentation tank (4), the aeration tank (3), the electrochemical tank (2), and the homogenizing regulating tank (1) in sequence from bottom to top; the bottom of the drainage cylinder (6) passes through the ecological filtration tank (5); and the treated leachate is discharged into the ground through the bottom of the drainage cylinder (6); The homogenizing regulating tank (1), the electrochemical tank (2), the aeration tank (3), the sedimentation tank (4), and the ecological filtering tank (5) are all annular grooves with an opening at the top; the inner and outer diameters of the homogenizing regulating tank (1) are the same as the inner and outer diameters of the electrochemical tank (2); the outer diameter of the aeration tank (3) is equal to the inner diameter of the electrochemical tank (2); the inner and outer diameters of the aeration tank (3) are the same as the inner and outer diameters of the sedimentation tank (4); and the outer diameter of the ecological filtering tank (5) is equal to the inner diameter of the sedimentation tank (4); The homogenizing regulating tank (1) is located above the ground, and the electrochemical tank (2), the aeration tank (3), the sedimentation tank (4), and the ecological filtering tank (5) are all located below the ground. The leachate discharged from the sewage inlet pipe (9) flows into the electrochemical tank (2), the aeration tank (3), the sedimentation tank (4), and the ecological filtering tank (5) in sequence under the action of its own gravity for treatment.

2. A heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: A partition (11) is fixed in the tank cavity of the homogenizing regulating tank (1), and the partition (11) divides the tank cavity of the homogenizing regulating tank (1) into an upper cavity and a lower cavity distributed vertically, the upper cavity and the lower cavity are connected via a U-shaped tube (12), a pH meter (14) for detecting the pH value of the leachate in the upper cavity is installed on the outer wall of the upper cavity, and when the electromagnetic valve at the outer end of the U-shaped tube (12) is closed, a pH regulating drug is added to the upper cavity to make the leachate weakly alkaline; The homogenizing regulating tank (1) is provided with a stirring element (13) for stirring the pH regulating drug and the filtrate, and a drainage pipe a (15) is provided on one side of the inner wall of the homogenizing regulating tank (1), the top end of the drainage pipe a (15) is connected to the upper cavity, and the bottom end of the drainage pipe a (15) is connected to the inside of the electrochemical cell (2), so as to guide the regulated filtrate into the electrochemical cell (2).

3. A heavy metal tailings pond leachate treatment device according to claim 2, characterized in that: The sewage inlet pipe (9) comprises a plurality of water outlets and two water inlets, the plurality of water outlets are arranged at the top of the homogenizing regulating tank (1), and the two water inlets are arranged at both sides of the homogenizing regulating tank (1) for extracting leachate from two locations simultaneously; The stirring member (13) comprises a plurality of stirring shafts (132) movably mounted inside the homogenizing regulating tank (1) via sealed bearings, the bottom ends of the stirring shafts (132) sequentially passing through the partition (11) and the bottom wall of the homogenizing regulating tank (1) and extending to the bottom of the homogenizing regulating tank (1), the stirring shafts (132) being movably connected to the partition (11) via sealed bearings, a plurality of groups of stirring blades (133) being fixed to the outer wall of each stirring shaft (132), one group of stirring blades (133) being located in the lower cavity, the plurality of stirring shafts (132) being divided into a plurality of groups in pairs, the top ends of the stirring shafts (132) located outside in each group being fixed with turbines (131), the turbines (131) being connected by means of support The frame is movably mounted at the outlet of the sewage inlet pipe (9); a gear a (134) is fixed to the bottom end of the stirring shaft (132); a gear ring a (135) is meshed on one side of the gear a (134); the gear ring a (135) is movably arranged at the bottom of the homogenizing regulating tank (1) via a slide rail; a plurality of gears b (136) arranged side by side are arranged inside the gear ring a (135); two adjacent gears b (136) are meshed; the inner wall of the gear ring a (135) is meshed with one of the gears b (136); the gear b (136) located on the inside is fixed to the bottom end of the stirring shaft (132) located on the inside in each group, and is used to drive the two stirring shafts (132) in each group to rotate in opposite directions.

4. A heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: A plate support (22) is fixed at the bottom of the electrochemical cell (2), and a plurality of plates (21) are fixed on the top of the plate support (22), wherein the number of the plate support (22) is an even number, wherein the plates (21) arranged at odd positions are connected to the negative electrode of an external power source via a wire, and the plates (21) arranged at even positions are connected to the positive electrode of the external power source via a wire, for electrolyzing the leachate flowing into the electrochemical cell (2); Two drainage pipes b (23) are fixed to the bottom wall of the electrochemical cell (2), and the drainage pipes b (23) are connected to the electrochemical cell (2) and the aeration tank (3) and are used to guide the leachate after electrolysis treatment into the aeration tank (3).

5. A heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: Both sides of the aeration tank (3) are fixedly connected to water inlet pipes (31), and a guide plate (36) inclined toward the aeration tank (3) is fixed on the top of each water inlet pipe (31), so that the leachate entering the water inlet pipe (31) through the drainage pipe b (23) will flow into the aeration tank (3) along the inclined surface of the guide plate (36); A plurality of cyclone aerators (37) are provided at the bottom of the aeration tank (3), and a stirring plate (32) for stirring the leachate is provided above the cyclone aerator (37). The stirring plate (32) is driven by a stirring plate driving member (33) to rotate inside the aeration tank (3) cavity. A liquid level gauge (35) for monitoring the liquid level inside the aeration tank (3) and two drainage pipes c (34) for connecting the aeration tank (3) and the sedimentation tank (4) are installed on the outer wall of the aeration tank (3). The leachate in the aeration tank (3) that has been treated by aeration flows into the sedimentation tank (4) through the drainage pipes c (34); The stirring plate driving member (33) comprises a gear ring b (331) fixed to the two stirring plates (32); the bottom of the gear ring b (331) is movably connected to a support platform a (334) via a slide rail; the outer wall of the support platform a (334) is fixed to the inner wall of the aeration tank (3); a gear c (332) is meshed inside the gear ring b (331); a rotating shaft a (333) is fixed in the middle of the gear c (332); the bottom end of the rotating shaft a (333) passes through the support platform a (334); the rotating shaft a (333) and the support platform a (334) are movably connected via a bearing.

6. A heavy metal tailings pond leachate treatment device according to claim 5, characterized in that: A guide ramp (41) is fixed at the bottom of the tank cavity of the sedimentation tank (4), the vertical cross-section of the guide ramp (41) is a triangle, the hypotenuse of the triangle is inclined toward the circle, two mud discharge pipes (49) arranged side by side are fixed inside the sedimentation tank (4), one end of the two mud discharge pipes (49) is connected to the inside of the sedimentation tank (4), and the other end of the two mud discharge pipes (49) is fixed with a conveyor b (410), and the outlet at the top of the conveyor b (410) is provided with a conveyor c (411); The top of the guide ramp (41) is provided with two scrapers (42) that match the inclined surface of the top of the guide ramp (41); the scrapers (42) are driven by a scraper driving member (47) to rotate forward and reverse in the tank cavity of the guide ramp (41); cone buckets (43) are fixed on both sides of the bottom of the sedimentation tank (4); the bottom end of the cone bucket (43) is connected to a return pipe (45); the outlet of the return pipe (45) is connected to a conveyor a (46); the outlet of the conveyor a (46) is connected to the water inlet pipe (31); and the biomass sludge in the sedimentation tank (4) is transported to the inside of the aeration tank (3) through the conveyor a (46); A through hole communicating with the inside of the cone bucket (43) is provided at the bottom of the diversion ramp (41) and at a position on the diversion ramp (41) corresponding to the cone bucket (43). There are two through holes in total. The two through holes are respectively provided on both sides of the tank cavity of the sedimentation tank (4). Two scrapers (42) are respectively provided on one side of the through hole. The rotating scrapers (42) push the biomass sludge from the through hole into the cone bucket (43); A plurality of drainage pipes d (48) are fixed to the inner wall of the sedimentation tank (4), the drainage pipes d (48) are connected to the sedimentation tank (4) and the ecological filter tank (5), and the upper layer of liquid after sedimentation in the sedimentation tank (4) is introduced into the ecological filter tank (5) through the drainage pipes d (48); The scraper driving member (47) comprises a support platform b (474) fixed to the inner wall of the sedimentation tank (4), a top side of the support platform b (474) is movably connected to a rotating shaft b (472) via a bearing, a bottom end of the rotating shaft a (333) is movably connected to the other side of the top of the support platform b (474) via a bearing, a gear d (471) is fixed to the top end of the rotating shaft b (472) and the bottom end of the rotating shaft a (333), and the two gears d (471) are externally meshed with a same gear ring c (4 73), the gear ring c (473) is movably mounted on the top of the support platform b (474) through a slide rail, the outer wall of the gear ring c (473) is fixed to the scraper (42), and a driving motor for driving the gear d (471) at the outer end of the rotating shaft b (472) to rotate forward and reverse is provided at the bottom end of the rotating shaft b (472), and the rotating gear d (471) drives the gear ring c (473) to drive the scraper (42) to rotate, and the angle of rotation of the gear d (471) in each direction is 180 degrees.

7. A heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: A filter plate (52) is fixed below the pool cavity of the ecological filter pool (5), an ecological filter bed (51) is provided on the top of the filter plate (52), and the ecological filter bed (51) comprises, from top to bottom, a soil layer, a fine sand layer, a fly ash layer, a gravel layer, a filler layer and a coarse sand layer, and emergent plants are planted above the soil layer; A plurality of drainage pipes e (53) for drainage are fixed at the lower part of the ecological filtration pool (5); one end of the drainage pipe e (53) is connected to the bottom of the pool cavity of the ecological filtration pool (5); the other end of the drainage pipe e (53) extends into the interior of the drainage tube (6) for discharging treated water into the interior of the drainage tube (6).

8. A heavy metal tailings pond leachate treatment device according to claim 6, characterized in that: The drainage cylinder (6) comprises a water funnel (61) fixed at the bottom end of the drainage cylinder (6), a blocking ball (62) is provided at the bottom outlet of the water funnel (61), and a suspension rope b (63) is fixed at the top of the blocking ball (62); The outer wall at the bottom end of the drainage cylinder (6) is provided with a plurality of filter holes (64), and filter screens are embedded in the filter holes (64) to prevent underground soil from entering the interior of the drainage cylinder (6).

9. A heavy metal tailings pond leachate treatment device according to claim 8, characterized in that: A blocking platform (44) is provided at the bottom outlet of the cone bucket (43), and the blocking platform (44) is used to block the outlet. A hanging rope a (412) is fixed to the top of the blocking platform (44); The end of the lifting rope a (412) away from the blocking platform (44) and the end of the lifting rope b (63) away from the blocking ball (62) are both provided with a rope reeling mechanism, and the lifting rope a (412) and the lifting rope b (63) are respectively reeled in by the rope reeling mechanism to drive the blocking platform (44) and the blocking ball (62) to move upward.

10. A heavy metal tailings pond leachate treatment device according to claim 8, characterized in that: The top of the outer wall of the homogenizing regulating tank (1), the top of the outer wall of the electrochemical tank (2), the top of the outer wall of the aeration tank (3), the top of the outer wall of the sedimentation tank (4), and the top of the outer wall of the ecological filtration tank (5) are all fixed with a steel structure platform (7) for convenient movement of personnel, and a staircase (8) is provided between the upper and lower steel structure platforms (7) for connecting the adjacent upper and lower steel structure platforms (7); A sampling tube (65) is fixed to the inner wall of the drainage tube (6), and a sampling platform (66) for connecting to a steel structure platform (7) outside the homogenization regulating tank (1) is provided on one side of the top of the drainage tube (6).

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